What Causes Rib Cage Pain After A Whipple Process?

Hi doctor , My father (72) went for Whipple process Sept 2013, and he reduced his weight to 35 Kg from 70, So we were not in position to go for a Chemo , so proceed with Homeo and Ayurveda , and passed these days , Now he having pain in his both ribcage, what we have to do sir ?